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Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at root s = 8 TeV

Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Friedl, M.; Frühwirth, R.; Ghete, V.M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; ... mehr

A measurement of the W boson helicity is presented, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. The data sample corresponds to an integrated luminosity of 19.7 fb −1 . The measured helicity fractions are F L = 0 . 298 ± 0 . 028 (stat) ± 0 . 032(syst), F 0 = 0 . 720 ± 0 . 039 (stat) ± 0 . 037(syst), and F R = −0 . 018 ± 0 . 019 (stat) ± 0 . 011(syst). These results are used to set limits on the real part of the tWb anomalous couplings, g L and g R .

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DOI: 10.5445/IR/1000045389
DOI: 10.1007/JHEP01(2015)053
Zitationen: 25
Web of Science
Zitationen: 18
Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1029-8479
KITopen-ID: 1000045389
Erschienen in Journal of High Energy Physics
Band 2015
Heft 1
Seiten 1-35
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in Web of Science
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